The difference between VAR (Vacuum Arc Remelting) and VIM (Vacuum Induction Melting) lies in the process and purpose of each technique.
VAR is a remelting process that involves melting a metal ingot in a vacuum chamber using an electric arc. This process helps to remove impurities and improve the material's homogeneity. VAR is commonly used in the production of high-quality metals and alloys, such as titanium, stainless steel, and nickel-based superalloys. The main purpose of VAR is to refine the material's microstructure and remove non-metallic inclusions.
On the other hand, VIM is a melting process that involves melting a metal in a vacuum chamber using electromagnetic induction. VIM is often used to produce high-purity metals and alloys, as the vacuum environment helps to minimize contamination. This technique is commonly used in the production of specialty metals and alloys, such as high-performance steels and superalloys. The aim of VIM is to achieve high purity and control over the material's composition.
In summary, the main difference between VAR and VIM is the process and purpose. VAR is a remelting process used to refine the microstructure and remove impurities, while VIM is a melting process used to achieve high purity and control over the composition.
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